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SEGMENT INFORMATION - Total Assets by Operating Segments (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Assets | $ 7,196.1 | $ 7,233.4
Operating Segments | U.S. Information Solutions |  |
Segment Reporting Information [Line Items] |  |
Assets | 1,579.7 | 1,587.3
Operating Segments | International |  |
Segment Reporting Information [Line Items] |  |
Assets | 3,174.8 | 3,145.7
Operating Segments | Workforce Solutions |  |
Segment Reporting Information [Line Items] |  |
Assets | 1,231.1 | 1,227.4
Operating Segments | Global Consumer Solutions |  |
Segment Reporting Information [Line Items] |  |
Assets | 251.6 | 254.0
General Corporate |  |
Segment Reporting Information [Line Items] |  |
Assets | $ 958.9 | $ 1,019.0

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